Jean, Yes, it is basically doing the same stuff as the OMAP idle code, but in a more generic way. It is mostly C, with assembler helper functions.
I need to find out whether I can release the code. Jon. -----Original Message----- From: Jean Pihet [mailto:jean.pi...@newoldbits.com] Sent: 12 October 2010 11:48 To: Jon Callan Cc: linaro-dev@lists.linaro.org Subject: Re: Common ARM context save/restore code Hi Jon, That is a nice follow up to the OMAP idle code clean up, cf. http://lists.linaro.org/pipermail/linaro-dev/2010-October/001084.html. It would be nice to see how the code is organized and the impact of integrating it into the kernel. Regards, Jean On Tue, Oct 12, 2010 at 12:39 PM, Jon Callan <jon.cal...@arm.com> wrote: > Vishwa, > > I have a more-or-less complete set of example code for CPU context > save/restore, currently supporting A5/A8/A9 and with planned support for > Eagle. > > It is structured as "firmware" at the moment, but it would be much better if > it was integrated into the ARM Linux kernel. The idea is the kernel calls it > from CPUidle, and it saves all CPU context and cuts the power. Then when > power returns, it restores all CPU context and returns to the kernel as if > nothing has happened. > > It handles just the CPU and cluster context, which on A9mpcore includes MMU, > GIC, VFP, SCU, L2cc, Debug, etc. It takes care of cleaning caches and > entering/leaving the coherency domain. There is also support for TrustZone, > but as you say that's quite platform-specific. > > So we would need to integrate this with the SoC-specific code somehow. > > Jon. > -- > I work Tue/Wed/Fri only > Jon Callan, Staff Software Engineer, Processor Division > ARM Cambridge / +44 1223 400814 > > > -- IMPORTANT NOTICE: The contents of this email and any attachments are > confidential and may also be privileged. If you are not the intended > recipient, please notify the sender immediately and do not disclose the > contents to any other person, use it for any purpose, or store or copy the > information in any medium. Thank you. > > _______________________________________________ > linaro-dev mailing list > linaro-dev@lists.linaro.org > http://lists.linaro.org/mailman/listinfo/linaro-dev > -- IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
